Or you could try something shorter!
SRB2WikiSonicMaster. Hmm...
SRB2Master
SRB2Wiki
SRB2Sonic
WikiSonic
WikiMaster
WikiSRB2
SonicMaster
SonicWiki
SonicSRB2
MasterSonic
MasterWiki
MasterSRB2
Okay, getting rid of the ones that suck, you are left with (in bold):
SRB2Master (SRB2 Guy, SRB2 Playah, SRB2Lover4Life, JOIN THE CLUB)
SRB2Wiki (You are the wiki, lol)
SRB2Sonic (Better than Sonic)
WikiSonic (Not bad)
WikiMaster (Not Bad)
WikiSRB2 (No.)
SonicMaster (You said you can't use it...)
SonicWiki (No.)
SonicSRB2 (...)
MasterSonic (Maybe)
MasterWiki (Maybe)
MasterSRB2 (No.)
So, SRB2Master, WikiSonic, WikiMaster, MasterSonic, and MasterWiki could all be used (as a permanent replacement to srb2wikisonicmaster lul) interchangeably. If you want to avoid being mistaken for 'SonicMaster', then use a different one! Strewth!